I found your recent answer to a ? about Canadian hemlocks. I live in Denmark...

Asked September 8, 2019, 10:55 AM EDT

I found your recent answer to a ? about Canadian hemlocks.

I live in Denmark (Europe) where NOBODY knows anything about Canadian hemlocks. My once beautiful 15+year-old hemlocks are dying, with no help of HWA - the little beasts have not arrived here yet! And still my trees are just loosing leaves and drying out, one of 9 is almost completely gone. I planted them 4 years ago, as adult trees of 8-9 ft tall. The soil is sandy, so, as recommended, I watered them once a week the first 3 hot and dry summers, and they were doing fine, every spring bringing small cones and fresh growth. Last summer (their 4th after they were planted here) was rainy, and I did not water any more, This summer I watered only as needed (once every 2-3 wks if no rain) but they are showing more and more of their light bare branches.., I never pruned them, as there is lots of space for them to grow freely, and frankly I like untrimmed nature much better than trimmed. (After all, nobody trims them in Canadian forests, do they? Yet they grow into beautiful majestic trees.)

Could you please please please tell me what to do?

Thanks in advance,


Maryland

1 Response

In general when trees are stressed due to poor growing conditions, poor planting techniques, poor drainage, poor soils, drought, etc. https://extension.umd.edu/sites/extension.umd.edu/files/_docs/programs/hgic/HGIC_Pubs/TreesandShrubs...
they can be susceptible to pest and disease issues. In this area hemlocks can be susceptible to several pests such as the hemlock woolly adelgid, scale(several types), and rust mites.
https://extension.umd.edu/hgic/topics/hemlock-woolly-adelgid-trees
https://extension.umd.edu/hgic/topics/armored-hard-scale-trees-and-shrubs

You should find out locally what is going on with your trees. There may be many variables such as the type of pests in your area, growing conditions, environment, etc. Perhaps you can contact the Denmark Forest Service and/or visit local botanical gardens or arboretums for more information in your area.

Marian